I found interesting Boris Johnsons proposal for a federal UK. Germany is a federal republic, as is Russia, and the US has a federal system also. Cameron is now facing new challenges, a more nationalist Scotland which will want to join the EU, and a conservative leaning England who might want out of the EU. Be interesting to see how he intends to reconcile a nationalist northern part of the UK, with England, Wales and Northern Ireland.

http://www.standard.co.uk/news/politics/boris-johnson-backs-grownup-conversation-on-federal-uk-to-fight-nationalism-10230034.html